Java tutorial
/* * Copyright 2011 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.androidtitlan.estoesgoogle.ui; import org.androidtitlan.estoesgoogle.R; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.database.ContentObserver; import android.database.Cursor; import android.graphics.Rect; import android.graphics.drawable.LayerDrawable; import android.net.Uri; import android.os.Bundle; import android.os.Handler; import android.provider.BaseColumns; import android.support.v4.app.Fragment; import android.text.format.DateUtils; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.TimeZone; import org.androidtitlan.estoesgoogle.provider.ScheduleContract; import org.androidtitlan.estoesgoogle.ui.widget.BlockView; import org.androidtitlan.estoesgoogle.ui.widget.BlocksLayout; import org.androidtitlan.estoesgoogle.ui.widget.ObservableScrollView; import org.androidtitlan.estoesgoogle.ui.widget.Workspace; import org.androidtitlan.estoesgoogle.util.AnalyticsUtils; import org.androidtitlan.estoesgoogle.util.Maps; import org.androidtitlan.estoesgoogle.util.MotionEventUtils; import org.androidtitlan.estoesgoogle.util.NotifyingAsyncQueryHandler; import org.androidtitlan.estoesgoogle.util.ParserUtils; import org.androidtitlan.estoesgoogle.util.UIUtils; /** * Shows a horizontally-pageable calendar of conference days. Horizontaly paging is achieved using * {@link Workspace}, and the primary UI classes for rendering the calendar are * {@link org.androidtitlan.estoesgoogle.ui.widget.TimeRulerView}, * {@link BlocksLayout}, and {@link BlockView}. */ public class ScheduleFragment extends Fragment implements NotifyingAsyncQueryHandler.AsyncQueryListener, ObservableScrollView.OnScrollListener, View.OnClickListener { private static final String TAG = "ScheduleFragment"; /** * Flags used with {@link android.text.format.DateUtils#formatDateRange}. */ private static final int TIME_FLAGS = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY | DateUtils.FORMAT_ABBREV_WEEKDAY; private static final long LUNES = ParserUtils.parseTime("2011-08-09T00:00:00.000-05:00"); private static final long MARTES = ParserUtils.parseTime("2011-08-10T00:00:00.000-05:00"); private static final long MIERCOLES = ParserUtils.parseTime("2011-08-11T00:00:00.000-05:00"); private static final int DISABLED_BLOCK_ALPHA = 100; private static final HashMap<String, Integer> sTypeColumnMap = buildTypeColumnMap(); // TODO: show blocks that don't fall into columns at the bottom public static final String EXTRA_TIME_START = "com.google.android.iosched.extra.TIME_START"; public static final String EXTRA_TIME_END = "com.google.android.iosched.extra.TIME_END"; private NotifyingAsyncQueryHandler mHandler; private Workspace mWorkspace; private TextView mTitle; private int mTitleCurrentDayIndex = -1; private View mLeftIndicator; private View mRightIndicator; /** * A helper class containing object references related to a particular day in the schedule. */ private class Day { private ViewGroup rootView; private ObservableScrollView scrollView; private View nowView; private BlocksLayout blocksView; private int index = -1; private String label = null; private Uri blocksUri = null; private long timeStart = -1; private long timeEnd = -1; } private List<Day> mDays = new ArrayList<Day>(); private static HashMap<String, Integer> buildTypeColumnMap() { final HashMap<String, Integer> map = Maps.newHashMap(); map.put(ParserUtils.BLOCK_TYPE_FOOD, 0); map.put(ParserUtils.BLOCK_TYPE_SESSION, 1); map.put(ParserUtils.BLOCK_TYPE_OFFICE_HOURS, 2); return map; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mHandler = new NotifyingAsyncQueryHandler(getActivity().getContentResolver(), this); setHasOptionsMenu(true); AnalyticsUtils.getInstance(getActivity()).trackPageView("/Schedule"); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { ViewGroup root = (ViewGroup) inflater.inflate(R.layout.fragment_schedule, null); mWorkspace = (Workspace) root.findViewById(R.id.workspace); mTitle = (TextView) root.findViewById(R.id.block_title); mLeftIndicator = root.findViewById(R.id.indicator_left); mLeftIndicator.setOnTouchListener(new View.OnTouchListener() { public boolean onTouch(View view, MotionEvent motionEvent) { if ((motionEvent.getAction() & MotionEventUtils.ACTION_MASK) == MotionEvent.ACTION_DOWN) { mWorkspace.scrollLeft(); return true; } return false; } }); mLeftIndicator.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { mWorkspace.scrollLeft(); } }); mRightIndicator = root.findViewById(R.id.indicator_right); mRightIndicator.setOnTouchListener(new View.OnTouchListener() { public boolean onTouch(View view, MotionEvent motionEvent) { if ((motionEvent.getAction() & MotionEventUtils.ACTION_MASK) == MotionEvent.ACTION_DOWN) { mWorkspace.scrollRight(); return true; } return false; } }); mRightIndicator.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { mWorkspace.scrollRight(); } }); setupDay(inflater, LUNES); setupDay(inflater, MARTES); setupDay(inflater, MIERCOLES); updateWorkspaceHeader(0); mWorkspace.setOnScrollListener(new Workspace.OnScrollListener() { public void onScroll(float screenFraction) { updateWorkspaceHeader(Math.round(screenFraction)); } }, true); return root; } public void updateWorkspaceHeader(int dayIndex) { if (mTitleCurrentDayIndex == dayIndex) { return; } mTitleCurrentDayIndex = dayIndex; Day day = mDays.get(dayIndex); mTitle.setText(day.label); mLeftIndicator.setVisibility((dayIndex != 0) ? View.VISIBLE : View.INVISIBLE); mRightIndicator.setVisibility((dayIndex < mDays.size() - 1) ? View.VISIBLE : View.INVISIBLE); } private void setupDay(LayoutInflater inflater, long startMillis) { Day day = new Day(); // Setup data day.index = mDays.size(); day.timeStart = startMillis; day.timeEnd = startMillis + DateUtils.DAY_IN_MILLIS; day.blocksUri = ScheduleContract.Blocks.buildBlocksBetweenDirUri(day.timeStart, day.timeEnd); // Setup views day.rootView = (ViewGroup) inflater.inflate(R.layout.blocks_content, null); day.scrollView = (ObservableScrollView) day.rootView.findViewById(R.id.blocks_scroll); day.scrollView.setOnScrollListener(this); day.blocksView = (BlocksLayout) day.rootView.findViewById(R.id.blocks); day.nowView = day.rootView.findViewById(R.id.blocks_now); day.blocksView.setDrawingCacheEnabled(true); day.blocksView.setAlwaysDrawnWithCacheEnabled(true); TimeZone.setDefault(UIUtils.CONFERENCE_TIME_ZONE); day.label = DateUtils.formatDateTime(getActivity(), startMillis, TIME_FLAGS); mWorkspace.addView(day.rootView); mDays.add(day); } @Override public void onResume() { super.onResume(); // Since we build our views manually instead of using an adapter, we // need to manually requery every time launched. requery(); getActivity().getContentResolver().registerContentObserver(ScheduleContract.Sessions.CONTENT_URI, true, mSessionChangesObserver); // Start listening for time updates to adjust "now" bar. TIME_TICK is // triggered once per minute, which is how we move the bar over time. final IntentFilter filter = new IntentFilter(); filter.addAction(Intent.ACTION_TIME_TICK); filter.addAction(Intent.ACTION_TIME_CHANGED); filter.addAction(Intent.ACTION_TIMEZONE_CHANGED); getActivity().registerReceiver(mReceiver, filter, null, new Handler()); } private void requery() { for (Day day : mDays) { mHandler.startQuery(0, day, day.blocksUri, BlocksQuery.PROJECTION, null, null, ScheduleContract.Blocks.DEFAULT_SORT); } } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); getActivity().runOnUiThread(new Runnable() { public void run() { updateNowView(true); } }); } @Override public void onPause() { super.onPause(); getActivity().unregisterReceiver(mReceiver); getActivity().getContentResolver().unregisterContentObserver(mSessionChangesObserver); } /** * {@inheritDoc} */ public void onQueryComplete(int token, Object cookie, Cursor cursor) { if (getActivity() == null) { return; } Day day = (Day) cookie; // Clear out any existing sessions before inserting again day.blocksView.removeAllBlocks(); try { while (cursor.moveToNext()) { final String type = cursor.getString(BlocksQuery.BLOCK_TYPE); final Integer column = sTypeColumnMap.get(type); // TODO: place random blocks at bottom of entire layout if (column == null) { continue; } final String blockId = cursor.getString(BlocksQuery.BLOCK_ID); final String title = cursor.getString(BlocksQuery.BLOCK_TITLE); final long start = cursor.getLong(BlocksQuery.BLOCK_START); final long end = cursor.getLong(BlocksQuery.BLOCK_END); final boolean containsStarred = cursor.getInt(BlocksQuery.CONTAINS_STARRED) != 0; final BlockView blockView = new BlockView(getActivity(), blockId, title, start, end, containsStarred, column); final int sessionsCount = cursor.getInt(BlocksQuery.SESSIONS_COUNT); if (sessionsCount > 0) { blockView.setOnClickListener(this); } else { blockView.setFocusable(false); blockView.setEnabled(false); LayerDrawable buttonDrawable = (LayerDrawable) blockView.getBackground(); buttonDrawable.getDrawable(0).setAlpha(DISABLED_BLOCK_ALPHA); buttonDrawable.getDrawable(2).setAlpha(DISABLED_BLOCK_ALPHA); } day.blocksView.addBlock(blockView); } } finally { cursor.close(); } } /** {@inheritDoc} */ public void onClick(View view) { if (view instanceof BlockView) { String title = ((BlockView) view).getText().toString(); AnalyticsUtils.getInstance(getActivity()).trackEvent("Schedule", "Session Click", title, 0); final String blockId = ((BlockView) view).getBlockId(); final Uri sessionsUri = ScheduleContract.Blocks.buildSessionsUri(blockId); final Intent intent = new Intent(Intent.ACTION_VIEW, sessionsUri); intent.putExtra(SessionsFragment.EXTRA_SCHEDULE_TIME_STRING, ((BlockView) view).getBlockTimeString()); ((BaseActivity) getActivity()).openActivityOrFragment(intent); } } /** * Update position and visibility of "now" view. */ private boolean updateNowView(boolean forceScroll) { final long now = UIUtils.getCurrentTime(getActivity()); Day nowDay = null; // effectively Day corresponding to today for (Day day : mDays) { if (now >= day.timeStart && now <= day.timeEnd) { nowDay = day; day.nowView.setVisibility(View.VISIBLE); } else { day.nowView.setVisibility(View.GONE); } } if (nowDay != null && forceScroll) { // Scroll to show "now" in center mWorkspace.setCurrentScreen(nowDay.index); final int offset = nowDay.scrollView.getHeight() / 2; nowDay.nowView.requestRectangleOnScreen(new Rect(0, offset, 0, offset), true); nowDay.blocksView.requestLayout(); return true; } return false; } public void onScrollChanged(ObservableScrollView view) { // Keep each day view at the same vertical scroll offset. final int scrollY = view.getScrollY(); for (Day day : mDays) { if (day.scrollView != view) { day.scrollView.scrollTo(0, scrollY); } } } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.schedule_menu_items, menu); super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == R.id.menu_now) { if (!updateNowView(true)) { Toast.makeText(getActivity(), R.string.toast_now_not_visible, Toast.LENGTH_SHORT).show(); } return true; } return super.onOptionsItemSelected(item); } private ContentObserver mSessionChangesObserver = new ContentObserver(new Handler()) { @Override public void onChange(boolean selfChange) { requery(); } }; private BroadcastReceiver mReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Log.d(TAG, "onReceive time update"); updateNowView(false); } }; private interface BlocksQuery { String[] PROJECTION = { BaseColumns._ID, ScheduleContract.Blocks.BLOCK_ID, ScheduleContract.Blocks.BLOCK_TITLE, ScheduleContract.Blocks.BLOCK_START, ScheduleContract.Blocks.BLOCK_END, ScheduleContract.Blocks.BLOCK_TYPE, ScheduleContract.Blocks.SESSIONS_COUNT, ScheduleContract.Blocks.CONTAINS_STARRED, }; int _ID = 0; int BLOCK_ID = 1; int BLOCK_TITLE = 2; int BLOCK_START = 3; int BLOCK_END = 4; int BLOCK_TYPE = 5; int SESSIONS_COUNT = 6; int CONTAINS_STARRED = 7; } }